"Useful life" means your product's lifetime - not your lifetime; in other words, your product's warranty lasts only until it has reached the point where it is no longer safely useful/functional, a point which varies for each product depending how often a product is used, where it is used, how well it has been cared for and maintained, etc. The wear and tear all products experience through use will cause them to show age and wear; the more a product is used, the faster the wear and tear will occur, and the faster that product will reach the end of its useful life.
What does "useful life" mean? How long is that?!
"Useful life" means your product's lifetime - not your lifetime; in other words, your product's warranty lasts only until it has reached the point where it is no longer safely useful/functional, a point which varies for each product depending how often a product is used, where it is used, how well it has been cared for and maintained, etc. The wear and tear all products experience through use will cause them to show age and wear; the more a product is used, the faster the wear and tear will occur, and the faster that product will reach the end of its useful life.